The objective of this work is to investigate the importance that non-operational expenses (NOE) on the activities of companies from different industrial sectors and their role on the economic and financial results of such companies. The companies with the greatest stock exchange presence are examined. The importance of the NOE is quantified as a proportion of the total expenses as well as of the operational expenses. The economic and financial result is explained by relating the total profit with total investment and equity. Results show that although NOE are negligible, they do originate a considerable change in the economic and financial results of corporations. The application of the F test shows a greater variance between different sectors as opposed to within a given sector.El objetivo de este trabajo es investigar la importancia que tienen los gastos no operacionales (GNO) en las actividades de las empresas de distintos sectores industriales y el rol que cumplen en sus resultados económicos y financieros. Se examinan las empresas con mayor presencia bursátil. La importancia de los GNO se precisa en proporción a los gastos totales y a los gastos operacionales. El resultado económico y financiero se explica relacionando la utilidad con la inversión total y el patrimonio. Las conclusiones muestran que aunque los GNO son insignificantes, originan un cambio considerable en los resultados económicos y financieros de las corporaciones. La aplicación de la prueba F destaca mayor variabilidad entre los sectores que dentro de los sectores.